Service and Maintenance

When does PG mix maximize its antifreeze protection? A. 100% PG B. 60:40 to water mix C. 50:50 mix D. 40:60 to water mix

A. 100% PG

After servicing and priming a diesel engine, what is the maximum duration cranking time permitted before resting? A. 30 seconds B. 1 min C. 2 min D. until battery dies

A. 30 seconds

Identify the organization responsible for classifying all engine oil sold in North America? A. API B.SAE C. TMC D. ATA

A. API

If a diesel engine is equipped with a diesel particulate filter (DPF) which of the following lube oil classifications must be used? A. CJ-4 B. CI-4 C. CF-4 D. GF-4

A. CJ-4

Tech A says that diesel fuel can be safely pumped at rates of up to 20 gallons per minute at a refueling station. Tech B says that portable diesel fuel container must be lined with zinc to prevent degradation. who is correct? A. Tech A B. Tech B C. Both A&B D. neither A or B

A. Tech A

Tech A says that filling an oil filter with clean engine oil prior to installation constitutes as priming it. Tech B says when oil filters are installed dry on engines equipped with and oil priming circuit, it is good practice to seal the gasket with silicone. Who is correct? A. Tech A B. Tech B C. Both A&B D. Neither A or B

A. Tech A

Tech A says that higher detergent oils aerate more easily. Tech B says that high detergent oils should be used in engines equipped with HEUI fuel system. Who is correct? A. Tech A B. Tech B C. Both A&B D. Neither A or B

A. Tech A

Technician A says that a diesel engine that is operated continuously under light and idle loads, can be classified as serve service operation. Tech B says that a diesel engine hauling cargo in a routine linehaul operation can be classified as severe service operation. Who is correct? A. Tech A B. Tech B C. Both A & B D. Neither A or B

A. Tech A

What is the main reason for the recommendation to thoroughly wash with soap and water after skin comes in contact with engine oil? A. it is a know carcinogen B. it is unsightly to have dirty hands C. it stains on contact D. it produces an unpleasant odor

A. it is a know carcinogen

What should be done when a WIF alert illuminates while the engine is running? A. shut down engine, drain water separator B. Shut down engine, drain fuel system C. add a quart of methyl hydrate to the fuel tank D. rev up engine rpm

A. shut down engine, drain water separator

When draining collected water from sump of a fuel/water separator, which of the following is recommended? A. turn off engine B. completely drain separator C. recycle the drain off into fuel tank D. drain the secondary filter

A. turn off engine

What is the recommended minimum amount of time to allow an oil pan to drain after removing the slump plug? A. 5 min B. 15 min C. 30 min D. 1 hour

B. 15 min

When does an EG to water mix maximize its antifreeze protection? A. 100% EG B. 60:40 to water mix C. 50:50 mix D. 40:60 to water mix

B. 60:40 to water mix

Tech A says it is good practice to refuel a diesel fueled truck with the engine running in cold weather. Tech B says the modern diesel fuel systems may be under moderate pressure so care must be taken when removing the fill cap. Who is correct? A. Tech A B. Tech B C. Both A&B D. Neither A or B

B. Tech B

Tech A says that adding kerosene to diesel fuel will enable faster cold starts during winter conditions without damaging engine. Tech B says that an APU can reduce overall cranking time in sub-zero weather. Who is Correct? A. Tech A B Tech B C. Both A&B D. Neither A or B

B. Tech B

Tech A says that the type of antifreeze can always be determined by its color. Tech B says that both PG and EG should be mixed with distilled water in order to maximize its service life. Who is correct? A. Tech A B. Tech B C. Both A&B D. Neither A or B

B. Tech B

Tech A says that when a DPF is regenerated, any accumulated ash is burned off. Tech B says that when a DPF is regenerated, entrapped soot is burned off. Who is correct? A. Tech A B. Tech B C. Both A&B D. Neither A or B

B. Tech B

What is another way to saying air filter restriction gauge? A. Pre-cleaner B. filter minder C. WIF sensor D. DEF alter

B. filter minder

What is the usual OEM recommendation when installing secondary fuel filters? A. fill with clean diesel fuel B. install dry, then prime the fuel system C. install dry and use ether to start engine D. install dry, then crank until engine fires

B. install dry, then prime the fuel system

what is the max amount of time biodiesel should be retained in a diesel engine fuel tank? A. one week B. one month C. 6 months D. one year

B. one month

After opening a container of premix ELC, what is the maximum amount of time it should be left before installing into a cooling system? A. one hour B. one week C. one month D. one year

B. one week

When should the engine crankcase oil level be checked? A. engine running B. immediately after shutdown C. 10 min after shutdown D. weekly

C. 10 min after shutdown

What does the crossed hatched area marked between low and high levels on a commercial vehicle oil dipstick typically convert into oil quantity? A. 1 quart B. 2 quarts C. 4 quarts D. 4 galllons

C. 4 quarts

Tech A says that most OEMs recommend priming oil filers prior to installation. Tech B says that some current diesel engines incorporate an integral oil priming circuit. Which tech is right? A. Tech A B. Tech B C. Both A & B D. Neither A or B

C. Both A & B

Tech A says however thoroughly a pre=delivery inspection (PDI) has been performed, there is always a chance something has been missed. Tech B says that a post-break-in check after a new or reconditioned engine has run its first 1000 linehaul miles is recommended. who is correct? A. Tech A B. Tech B C. Both A&B D. Neither A or B

C. Both A&B

Tech A says that some OEM dealerships recommend that oil samples be mailed in for laboratory testing. Tech B says that the accurate spectrographic oil analysis can be performed in the service garage using Truck Check Onsite analysis. Who is correct? A. Tech A B. Tech B C. Both A&B D. Neither A or B

C. Both A&B

Tech A says that some oil pan plugs on newer diesel engines only require a 1/4 turn to fully tighten. Tech B says that most oil pan sump plugs are removed and re-torqued using a 3/8-inch square socket drive. Who is correct? A. Tech A B. Tech B C. Both A&B D. Neither A or B

C. Both A&B

When a diesel engine is operated exposed to dense grain chaff, which of the following devices can help extend air filter life? A. lower restriction filter B. higher restriction filter C. air filter pre-cleaner D. adding methyl hydrate to fuel tank

C. air filter pre-cleaner

What is required to access the data bus and download data on a vehicle chassis? A. ignition key B. any computer C. an electronic service tool D. OEM permission

C. an electronic service tool

When is an engine air filter said to function at its best efficiency? A. brand new B. mid-life C. just before it fails D. when exposed to hostile conditions

C. just before it fails

What does the slang term wet service refer to in the context of a diesel engine? A. engine pressure wash B. pencil service C. oil and filter change D. engine overhaul

C. oil and filter change

What API oil classification I suitable for engines fueled by ultra-low sulfur (ULS) fuel? A. CF-2 B.CI-4 C. CH-4 D. CJ-4

D. CJ-4

Identify the organization that sets the standards by which manufacturers grade engine oils by viscosity? A. ATA B. API C. TMC D. SAE

D. SAE

Which type of diesel engine coolant is said to be able to last for the life of the engine? A. EG B. PG C. ELC D. WEC

D. WEC

What is a synthetic oil likely to achieve when compared to a petroleum base diesel engine oil? A. resistance to breakdown B. better tolerance to extreme temps C. extended service life D. all of the above

D. all of the above

What is the reason that accelerator pedal input may be disabled during cranking when temp drops below 32 degrees F? A. it freezes easily B. electrical signals are inhibited C. driver is not pushing hard enough D. cold start strategy

D. cold start strategy

Which of the following is a good practice when breaking in a new or reconditioned diesel engine? A. use of a specialty break-in lube B. idle for one hour after starting C. light load operation for 1000 miles D. Load down the engine to seat rings

D. load down the engine to seat rings

What is the recommended procedure when preparing an EG and distilled water coolant for installation into an engine? A. pour distilled water in radiator first followed by EG concentrate B. pour EG in radiator first followed by distilled water C. alternate EG and distilled water into radiator one quart at a time D. mix EG and distilled water outside the radiator: pour into radiator as mixture

D. mix EG and distilled water outside radiator, pour in as mixture

When a highway diesel engine DEF warning strategy defaults to trimback mode, what should be done? A. regenerate the DPF B. drive in a lower gear C. replace the engine air filter D. replenish the DEF tank

D. replenish the DEF tank